Can you have instant e-mail notifications on FORUM subscriptions?

[MrSquid]

Can you have instant e-mail notifications on FORUM subscriptions? My site will be offering lead opportunities to a group of people - my hope is that users would subscribe to the forum for a particular state and then automatically receive an e-mail that someone has posted a lead opportunity in their state.

When I subscribe to a forum I see the opportunity for daily and weekly updates, but not instant updates. (some of these forums might get posted to once-per-day, others might get posted to once-per-month)